https://www.cnet.com/news/hubble-captures-haunting-ghost-nebula-for-halloween/

The Ghost Nebula is located in the "W"-shaped constellation Cassiopeia. It's easy to see how it earned its spooky nickname thanks to what NASA poetically calls its "flowing veils of gas and dust." 

"The nebula is being blasted by a torrent of radiation from a nearby, blue-giant star called Gamma Cassiopeiae, which can be easily seen with the unaided eye at the center of the distinctive 'W' asterism that forms the constellation," says NASA.